Peeknamedpipe

[DllImport("Kernel32.dll", SetLastError = true)][return: MarshalAs(UnmanagedType.Bool)]
public static extern bool PeekNamedPipe(IntPtr hNamedPipe,
   byte[] lpBuffer,
   uint nBufferSize,
   ref uint lpBytesRead,
   ref uint lpTotalBytesAvail,
   ref uint lpBytesLeftThisMessage
);

Microsoft documentation: Link

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